恶性毛母质瘤是一种较罕见的恶性肿瘤，国内报告甚少。我们在病理活检中遇见3例。现将其临床病理学特征报告如下，并就其诊断及鉴别诊断问题进行讨论。1临床病理资料例1：女，45岁，1987年发现头枕部包块，渐长大，曾作2次冷冻治疗。1994年上半年包快增大迅速。头枕部突起一“ Malignant glioblastoma is a rare malignant tumor and its domestic reports are very few. We met 3 cases on pathological biopsy. The clinicopathological features are reported below, and their diagnosis and differential diagnosis are discussed. 1Clinical and pathological data Example 1: Female, 45 years old, discovered a head occipital mass in 1987 and grew up. He had twice cryotherapy. In the first half of 1994, the package grew rapidly. Headrest protrusion